Transport and Extraction of Radioactive Ions in Superfluid Helium

• Project/Area Number: 14540283
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Single-year Grants
• Section: 一般
• Research Field: 素粒子・核・宇宙線
• Research Institution: Osaka Gakuin University
• Principal Investigator: TAKAHASHI Noriaki Osaka Gakuin University, Dept. of Distribution and Communication Sciences, Professor, 流通科学部, 教授 (10028152)
• Co-Investigator(Kenkyū-buntansha): SHIMODA Tadashi Osaka University, Graduate School of Science, Professor, 大学院・理学研究科, 教授 (70135656)
• Project Period (FY): 2002 – 2004
• Project Status: Completed (Fiscal Year 2004)
• Budget Amount: ¥3,400,000 (Direct Cost: ¥3,400,000); Fiscal Year 2004: ¥500,000 (Direct Cost: ¥500,000); Fiscal Year 2003: ¥1,200,000 (Direct Cost: ¥1,200,000); Fiscal Year 2002: ¥1,700,000 (Direct Cost: ¥1,700,000)
• Keywords: Superfluid Helium / Impurity Ions / Radiation Detection Method / Snowball / Nuclear Polarisation / Extraction of Positive Ions / Transport Phenomena / Potential Barrier

Research Abstract

Described here are experiments on the transport under electric field and the extraction of impurities from the surface of superfluid helium. As impurities we introduced radioactive heavy ions into helium. We established an experimental method of production, transport and extraction of ions in superfluid helium by using radiation detection method. With this method we tackled with determination of extraction probability, its dependence on temperature and barrier height at the interface of liquid-vapour phases.
The improvements realised were ; 1.extraction potential barrier for the positive ions has been determined for the first time and this is almost equivalent for the extraction of electrons. 2.The snowball production rate at the 215Po source has been improved by applying higher electric field on the surface of the source. 3.The extraction has become more effective by using pulsed second sound for raising locally and instantaneously the surface temperature. We attained the precise determination of probability, its temperature dependence on barrier height. Nuclear spectroscopy experiments with radioactive nuclear beams have been developed further in parallel with these.
Rich variety of heavy-ion reaction products will be stopped in superfluid helium and emerge as ultra-cold (zero- energy) radioactive beams. It is expected that this novel method is applicable in the new projects planned in the world. The GSI Darmstadt is counted as one of such institutions.

Research Products

• [Journal Article] Radioactive charge carriers in liquid helium created from fast nuclear beams (2004)
  • Author(s): N.Takahashi
  • Journal Title: Fizika B 12 Pages: 135-144
  • Description: 「研究成果報告書概要(和文)」より
• [Journal Article] Spectroscopic Study of 11Be through β-delayed Neutron- and γ-decays of Spin-polarized 11Li (2004)
  • Author(s): Y.Hirayama et al.
  • Journal Title: Nuclear Physics, A 738 Pages: 201-205
  • Description: 「研究成果報告書概要(和文)」より
• [Journal Article] Exclusive Measurement of the Astrophysical 8Li(α,n) Reaction Cross Section (2004)
  • Author(s): H.Miyatake et al.
  • Journal Title: Nuclear Physics A 738 Pages: 401-405
  • Description: 「研究成果報告書概要(和文)」より
• [Journal Article] Spectroscopic Study of 11Be through β-delayed Neutron- and γ-decays of Spin-polarized 11Li (2004)
  • Author(s): Y.Hirayama, T.Shimoda, H.Izumi, H.Yano, M.Yagi, A.Hatakeyama, C.D.P.Levy, K.P.Jackson, H.Miyatake
  • Journal Title: Nuclear Physics, A 738 Pages: 201-205
  • Description: 「研究成果報告書概要(欧文)」より
• [Journal Article] Exclusive Measurement of the Astrophysical 8Li(α,n) Reaction Cross Section (2004)
  • Author(s): H.Miyatake, H.Ishiyama, M-H.Tanaka, Y.X Watanabe, N.Yoshikawa, S.C., Jeong, Y.Matsuyama, Y.Fuchi, T.Nomura, T.Hashimoto, T.Ishikawa, K.Nakai, S.K.Das, P.K.Saha, T.Fukuda, K.Nishio, S.Mitsuoka, H.Ikezoe, S.Ichikawa, M.Matsuda, Y.Mizoi, T.Furukawa, H.Izumi, T.Shimoda, M.Terasawa
  • Journal Title: Nuclear Physics A 738 Pages: 401-405
  • Description: 「研究成果報告書概要(欧文)」より
• [Journal Article] Spectroscopic Study of 11Be through β-delayed Neutron- and γ-decays of Spin-polarized 11Li (2004) (2004)
  • Author(s): Y.Hirayama et al.
  • Journal Title: Nuclear Physics, A 738 Pages: 201-205
• [Journal Article] Production of zero energy radioactive beams through extraction across superfluid helium surface (2003)
  • Author(s): N.Takahashi et al.
  • Journal Title: Physica B 329-333 Pages: 1596-1597
  • Description: 「研究成果報告書概要(和文)」より
• [Journal Article] Extraction of radioactive positive ions across the surface of superfluid helium -A new method to Produce cold radioactive nuclear beams- (2003)
  • Author(s): W.X.Huang et al.
  • Journal Title: Europhys Lett. 63 Pages: 687-693
  • Description: 「研究成果報告書概要(和文)」より
• [Journal Article] Transport and extraction of radioactive ions stopped in superfluid helium (2003)
  • Author(s): W.X.Huang et al.
  • Journal Title: Nucl.Instr.Meth.B 204 Pages: 592-596
  • Description: 「研究成果報告書概要(和文)」より
• [Journal Article] Direct Measurements of (α,n) and (p,n) Reaction Cross Sections Using Light Neutron-Rich Radioactive Nuclear Beams (2003)
  • Author(s): H.Ishiyama et al.
  • Journal Title: Nuclear Physics, A 718
  • Description: 「研究成果報告書概要(和文)」より
• [Journal Article] Measurement of the 16N(α,n) Reaction Cross Section (2003)
  • Author(s): T.Ishikawa et al.
  • Journal Title: Nuclear Physics, A 718
  • Description: 「研究成果報告書概要(和文)」より
• [Journal Article] Production of zero energy radioactive beams through extraction across superfluid helium surface (2003)
  • Author(s): N.Takahashi, W.X.Huang, K.Gloos, P.Dendooven, J.P.Pekola, J.Aysto
  • Journal Title: Physica B 329-333 Pages: 1596-1597
  • Description: 「研究成果報告書概要(欧文)」より
• [Journal Article] Extraction of radioactive positive ions across the surface of superfluid helium -A new method to Produce cold radioactive nuclear beams- (2003)
  • Author(s): W.X.Huang, P.Dendooven, K.Gloos, K.Arutyunov, N.Takahashi, J.P.Pekola, J.Aysto
  • Journal Title: Europhys Lett. 63 Pages: 687-693
  • Description: 「研究成果報告書概要(欧文)」より
• [Journal Article] Transport and extraction of radioactive ions stopped in superfluid helium (2003)
  • Author(s): W.X.Huang, P.Dendooven, K.Gloos, N.Takahashi, J.P.Pekola, J.Aysto
  • Journal Title: Nucl.Instr.Meth.B 204 Pages: 592-596
  • Description: 「研究成果報告書概要(欧文)」より
• [Journal Article] Spin-parity Assignments in 15C^* by a New Method : β-Delayed Spectroscopy for a Spin-Polarized Nucleus (2003)
  • Author(s): H.Miyatake, H.Ueno, Y.Yamamoto, N.Aoi, K.Asahi, E.Ideguchi, M.Ishihara, H.Izumi, T.Kishida, T.Kubo, S.Mitsuoka, Y.Mizoi, M.Notani, H.Ogawa, A.Ozawa, M.Sasaki, T.Shimoda, T.Shirakura, N.Takahashi, S.Tanimoto, K.Yoneda
  • Journal Title: Physical Review, C 67
  • Description: 「研究成果報告書概要(欧文)」より
• [Journal Article] Direct Measurements of (α,n) and (p,n) Reaction Cross Sections Using Light Neutron-Rich Radioactive Nuclear Beams (2003)
  • Author(s): H.Ishiyama, T.Hashimoto, T.Kawamura, T.Ishikawa, H.Miyatake, M.H.Tanaka, Y.Fuchi, N.Yoshikawa, S.C.Jeong, Y.Watanabe, H.Kawakami, I.Katayama, T.Nomura, S.Mitsuoka, K.Nishio, M.Matsuda, S.Ichikawa, H.Ikezoe, T.Furukawa, H.Yano, H.Izumi, Y.Mizoi, M.Terasawa, T.Fukuda, K.Nakai, T.Shimoda
  • Journal Title: Nuclear Physics, A 718
  • Description: 「研究成果報告書概要(欧文)」より
• [Journal Article] Measurement of the 16N(α,n) Reaction Cross Section (2003)
  • Author(s): T.Ishikawa, H.Ishiyama, T.Hashimoto, T.Kawamura, H.Miyatake, M.H.Tanakab, Y.Fuchi, N.Yoshikawa, S.C.Jeong, Y.Watanabe, H.Kawakami, I.Katayama, T.Nomura, S.Mitsuoka, K.Nishio, M.Matsuda, S.Ichikawa, H.Ikezoe, T.Furukawa, H.Yano, H.Izumi, Y.Mizoi, M.Terasawa, T.Fukuda, K.Nakai, T.Shimoda
  • Journal Title: Nuclear Physics, A 718
  • Description: 「研究成果報告書概要(欧文)」より
• [Journal Article] Spin-parity Assignments in 15C^* by a New Method : β-Delayed Spectroscopy for a Spin-Polarized Nucleus (2003)
  • Author(s): H.Miyatake et al.
  • Journal Title: Physical Review, C 67
• [Journal Article] Spin Polarization of Low-Energy Radioactive Nuclear Beams by Tilted-Foil Technique (2002)
  • Author(s): S.Shimizu et al.
  • Journal Title: Nuclear Physics, A 701
  • Description: 「研究成果報告書概要(和文)」より
• [Journal Article] A Spin Polarizer for Radioactive Nuclear Beams by Taking Advantage of Polarized Electron Transfer Reactions (2002)
  • Author(s): T.Shimoda et al.
  • Journal Title: Nuclear Physics, A 701
  • Description: 「研究成果報告書概要(和文)」より
• [Journal Article] Spin Polarization of Low-Energy Radioactive Nuclear Beams by Tilted-Foil Technique (2002)
  • Author(s): S.Shimizu, E.Doumoto, M.Yagi, M.Asai, M.Nakamura, Y.Hirayama, K.Horie, T.Shigematsu, H.Izumi, T.Shimoda, N.Takahashi
  • Journal Title: Nuclear Physics, A 701
  • Description: 「研究成果報告書概要(欧文)」より
• [Journal Article] A Spin Polarizer for Radioactive Nuclear Beams by Taking Advantage of Polarized Electron Transfer Reactions (2002)
  • Author(s): T.Shimoda, S.Shimizu, E.Doumoto, M.Yagi, M.Asai, M.Nakamura, Y.Hirayama, K.Horie, T.Shigematsu, H.Izumi, N.Takahashi
  • Journal Title: Nuclear Physics, A 701
  • Description: 「研究成果報告書概要(欧文)」より
• [Journal Article] Spin-parity Assignments in 15C^* by a New Method : β-Delayed Spectroscopy for a Spin-Polarized Nucleus.
  • Author(s): H.Miyatake et al.
  • Journal Title: Physical Review, C 67
  • Description: 「研究成果報告書概要(和文)」より
• [Publications] W.X.Huang, N.Takahashi,...: "Transport and extraction of radioactive ions stopped in superfluid helium"Nuclear Instruments and Methods B. B204. 592-596 (2003)
• [Publications] N.Takahashi et al.: "Production of zero energy radioactive beams through extraction across superfluid helium surface"Physica B. B329-333. 1596-1598 (2003)
• [Publications] W.X.Huang, N.Takahashi,...: "Extraction of radioactive positive ions across the surface of super-fluid helium : A new method to produce cold radioactive nuclear beams"Europhys.Lett.. 63. 687-693 (2003)
• [Publications] W.X.Huang, N.Takahashi, et al.: "Transport and extraction of radioactive ions stopped in superfluid helium"Nuclear Instruments and Methods B. (2003)
• [Publications] N.Takahashi et al.: "Production of zero energy radioactive beams through extraction across superfluid helium surface"Physica B. (2003)
• [Publications] S.Shimizu, T.Shimoda, N.Takahashi et al.: "Spin Polarization of Low-Energy Radioactive Nuclear Beams by Tilted-Foil Technique"Nuclear Physics. A701. 524c-527c (2002)
• [Publications] H.Miyatake, T.Shimoda, N.Takahashi, et al.: "Spin-parity Assignments in 15C by a New Method : Beta-Delayed Spectroscopy for a Spin-polarized Nucleus"Phys.Rev.C. 67. 014306-014314 (2003)
• [Publications] A.Hatakeyama, T.Shimoda, et al.: "Optical pumping at the ISAC polarizer"Proc. 9th Intl. Workshop on Polarized Sources and Targets. 339-343 (2002)